Usually the directive "don't worry about bloat" comes from above, or outside, the software engineering team. I'm a software engineer and I would love to fix performance problems so that everything runs Amiga smooth. But that takes time and effort to find, analyze, and fix performance issues... and once The Business sees something in more or less working order, implementing the next feature takes priority over removing bloat. "Premature optimization is the root of all evil" and that. I know that's not what Knuth meant, he meant don't be penny-wise and pound-foolish when you do optimize. But much like "GO TO considered harmful", something approaching the stupidest possible interpretation of the maxim has become the canonical interpretation.

And that's before getting into when The Business wants that sweet, sweet analytics data, or those sweet, sweet ad dollars.